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This question already has an answer here:

Can we use Multi-Vehicle Automatic Transmission Fluid (ATF) for a transmission that Manufacturer specified to use Toyota-IV?

marked as duplicate by CharlieRB, Pᴀᴜʟsᴛᴇʀ2 Jan 24 '18 at 21:54

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Answer from the Star Tribune, of all places: http://www.startribune.com/brand-clearing-up-confusion-over-transmission-fluid/283401841/

The T-IV automatic transmission fluid meets industry specification JWS3309. Here are several automatic transmission fluids that are listed as suitable for T-IV applications: Valvoline MaxLife Dex/Merc ATF, Mobil 1 Synthetic ATF, Castrol Trans-Max Synthetic ATF, Quaker State Ultimate Synthetic Multi-vehicle ATF, Pennzoil Multi-Vehicle Automatic Transmission Fluid — to name just a few. Mobil ATF 3309 is a JWS3309-spec transmission fluid engineered for this application.

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